What is the implication of a cell structure such as mitochondria or chloroplast having DNA?A. Because they were formed as a direct product of the nucleusB. Because they may have originated as their own form of ancient bacteria, eventually joining the cell structureC. Because the RNA often gets lost leaving the nuclear envelope, ending up in the mitochondria where it is converted back into DNAD. Because the mitochondria is the second biggest producer of DNA information apart from the nucleus

Which of the following statements is TRUE regarding the curvature of tooth roots?

The cusp of Carabelli is located on the __________.

Which has an oblique ridge? (Select all that apply.)

How does the polarity of a water molecule enable it to exhibit high surface tension?A. The hydrogen atoms form strong ionic bonds with oxygen atoms in other molecules.B. The non-polar nature of water allows it to spread easily and evaporate faster.C. The partial charges on water molecules lead to hydrogen bonding, which pulls water molecules tightly together at the surface.D. Water molecules have no charge, so surface tension is due to atmospheric pressure alone.

Which of the following statements best describes the general rule of permanent molar identification?

What is the name of the ion that increases in concentration when an acid is added to water?A. Hydroxide IonB. Hydronium IonC. Oxide IonD. Buffer Ion

How do hydrogen bonds affect the amount of time it takes for water to heat up? A. Polar molecules have fewer hydrogen bonds which allows them to move quickly, causing them to slowly heat upB. Non-polar and polar molecules have the same amount of hydrogen bonds which causes them to slowly heat upC. Polar molecules have too many packed together which causes them to slowly heat upD. Polar molecules need hydrogen bonds to be broken up in order for them to heat up, which causes water to slowly heat upE. Non-polar molecules have hydrogen bonds that easily break up, which makes them heat up quickly compared to polar molecules

What is the primary factor determining whether an atom will bond with another atom to achieve a stable electron configuration?A. The number of neutrons in the atomB. The amount of heat energy available to the atomsC. The number of valence electrons in the atomD. The size of the atomic nucleus

Bonus question (5 points) ref: OpenAI’s Sora, using the prompt — “Create two videos in which an economics professor teaches the economics of AI, one with a smiling face and one without.” First, generate a base image of the professor. Second, create a video without a smile. Then, generate the smiling version of the video using additional prompts. The entire process takes approximately 5–10 minutes. An economics professor wants to estimate the effect of smiling during online lectures on students’ academic performance. To mitigate omitted variable bias and confounding factors, the professor employs a randomized controlled trial (RCT). Prior to implementing the RCT, the professor uses AI to generate counterfactual images and videos of themselves smiling. Students in the control group are randomly assigned to watch recorded lectures or view images of the professor without a smile. Students in the treatment group are randomly assigned to watch the same lectures or view images of the professor with a smile (generated using AI). The goal is to estimate the counterfactual treatment effect of the professor’s smile on students’ learning outcomes in an online setting based on the following linear regression equation: